Malicious PDF — malware analysis report

Static analysis result for SHA-256 14e4ffd982278d72…

MALICIOUS

PDF

87.2 KB Created: 2021-09-15 23:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 88fba64366cbb31f4dcdbb8d0c26cc80 SHA-1: 464d988fc52399ffabd8e403163c6a501d91a482 SHA-256: 14e4ffd982278d72290540f8553403d9523b5dfa9f0ac90f38bbb1fcde35c7e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/xelutinuxeg.pdf In PDF document text
    • http://195exim.com/datas/files/lolonifalutikaka.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/42776983537.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/kisowirivemelopew.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/darugemuloxowor.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/94753077480.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/51440444778.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/43170941785.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce725e039d0a25295f5b2e6ae96da9da/domoduluwonujomokajetedug.pdfIn PDF document text
    • https://raljob.com/userfiles/file/rolatugofalazamobupob.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/jurudadegiz.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/rewudawovijap.pdfIn PDF document text
    • https://euchebnici.com/img/file/naxinixurifaj.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/xapipoduz.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/8197261190.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-12/20210912002547903285.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/55133764901.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/35100873014.pdfIn PDF document text
    • http://grupophi.es/uploads/files/50452182435.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/50483149441.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/78273294092.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/78275901155.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6407944d5---27042422358.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/92215617325.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/waxina.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/turexomi.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4e4256f97---72747939164.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f17c10fe---1392020399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=robux+without+human+verification+2020PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 18320 bytes
SHA-256: fbd07e2cc5e24078e6b2c9cb002027353d3ff388b5b050096ef1ae863dcc5d29
font_01_sfnt_off00011c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 11168 bytes
SHA-256: c450f58022d1ffe3131faae49bc9b86b11e53022211fcb8d0926b97a97b65a0c
font_02_sfnt_off00013644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1